#ifndef __COMM_HPP__
#define __COMM_HPP__

#include<iostream>
#include<cerrno>
#include<cstdio>
#include<cstring>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<sys/types.h>
#include<cassert>
using namespace std;
#define PATHNAME "."
#define PROJID 0x6666

const int gsize=4096;
key_t getkey()
{
    key_t k=ftok(PATHNAME,PROJID);
    if(k==-1)
    {
        cerr<<errno<<" : "<<strerror(errno)<<endl;
        exit(1);
    }
    return k;
}

string toHex(int x)
{
    char buffer[64];
    snprintf(buffer,sizeof buffer,"0x%x",x);
    return buffer;
}

int createShm(key_t k,int size)//server
{
    int shmid= shmget(k,size,IPC_CREAT | IPC_EXCL);
    if(shmid==-1)
    {
        cerr<<errno<<" : "<<strerror(errno)<<endl;
        exit(2);
    }
    return shmid;
}

int getShm(key_t k,int size)//client
{
    int shmid=shmget(k,size,IPC_CREAT);
    if(shmid==-1)
    {
        cerr<<errno<<" : "<<strerror(errno)<<endl;
        exit(2);
    }
    return shmid;
}

void delShm(int shmid)
{
    int n=shmctl(shmid,IPC_RMID,nullptr);
    assert(n!=-1);
    (void)n;
}






#endif